Improvement in draft-regulators



1. HAYES.

. DRAFT-REGULATOR. No .177,1Z1Y. Patented May 9,1876.

JUN/71!??? NJETERS PHOTO-LHNOGRAPMER. WASHINGTONv D C.

dent of the city of Philadelphia, in the Statepanying drawings, inwhichpurpose of showing more clearly the peculiar;

hot the fire-draft valve will be .partially contractedor closed, and theohim hey-draft damp- "NITED TATES PATENT l-Orrio ISAAC HAYES,OFPHILADELPHIA, PENNSYLVAJSIIA.

Specification forming part of LettersPatent No. 17%,12-1, datedMayQ,1876 application filed .April 11, 1876.

vTo all whom itmay concern: I I Be it"known that 'I, ISAAC HAYES, aresi-' of'Pennsylvania, hai e invented a new and useful Improvement inAutomatic Heat-Reg-f ulators for Hot-Air Furnaces, which .improvev mentis fully set forth in the following :speci-g ficatiOm reterence beingbad to the acoonr;

Figure l 'is a perspective view of the exterior of the front, and oneside of an ordinary? hot-air furnace, having .myinvention applied Ithereto; and l igsi2 and 3 respective views? of the valve-plate anditscorrespondin g mouth f (of either of the three valves) detached, forthe-E construction of the same. 1

My invention relates more especially to the heat-regulators for hot-airfurnaces, for cer- I tain improvement in which Letters Patent of i theUnited States No. 128,485 were granted to me, dated July 2, .1872, thecharacteristic feature of my said improvement consisting inthecombination and arrangementof a fire-draft valve and a chimney-draftdamper-valve, operated simultaneously, to regulate the degree of heatdesired in the air of the air-heating? chamber of the furnace, by theexpansionand contraction of thea'ir'in the air-heating cham-- ber uponan inclosed elastic diaphragm, connected with a weighted lever,so thatwhen the air in the heatingchamber becomes too er partially or morefully opened, and vice versa, when the air in the air-heating chamberhas become too cool, thusautomatically keeping the temperature of therequired heatedair nearly uniform.

There is a defect, however, in the abovedescribed automaticheat-regulator, in that there is not any provision for regulating thesupply of fresh air into the heating-chamber, which is a defecttheremoval of which is of very considerable importance-because, in suchcase the supply of the fresh cold air to the air-heating chamber isnearly invariable in quantity, while the heat generated by thecombustion of the fuel in the fire-box or cylinder is Variable, andconsequently when the fire is low or weak the said fresh-air currentmouth of the inlet for the fresh air which is.

to be warmed, of an automaticallyactuated valve, arranged to work as.will hereinafter be described.

Another object of mysaid present improvement relates to the peculiarstructure-of the. several valves, especially as to the mode ofconnecting the plate with the seat, whereby they will operate togetherwith more accuracy and ease, and cost less in construction .and

application.

Referring to Fig. l, A is thefurnace; :B, the firedraft valve; 0, thefresh cold .air draft valve; D, the chimney-damper'val-ve; vE, the.case,containing the usual elastic diaphragm (not shown) communicatingwiththe'aieheating chamber in the furnace A, and with theIcooling=cylinderiF on the outside of the said furnace A, by means ofthe tubes or pipes f f; G, the rigid stem fixed to the diaphragnr in E,and connected to the rock-shaft g, the

.outer end of which .carries the adjustablyweighted lever H, andtheinner projecting end carries the lever I, and the right-hand arm ofwhich latter is connected by a chain or wire, 0, to the .plate of valve0, and the op- .posite arm in the same vmanner to the plate of thefire-draft valve B, and also to the plate of the chimney-damper valve Dabove, by means of the turn-buckles K K, and the connectingwires orchains 3 4 5, substantially as represented in the drawing, Fig. 1.The-connections between the valves BO D are adjustably attached togetherand to the horizontallyarranged lever I of the rock-shaft g,.whichcarries the adjustably weighted lever H, so as to operatetogether,substantially as will now be described and explained, inregulating the temperature of the air passing through the air-heatingchamber of the furnace.

When the furnace is working under an ordinarily-good fire the plate ofthe fire-draft valve'B will be held nearly in a horizontal position, ornot quite fully opened, the plate of the fresh cold air valve 0partially opened, and the plate of the damper-valve D closed,

down nearly air-tight, as shown in Fig. .1; but if the fire becomestronger, and consequently the airpassing through the air-heatingchamber raised in temperature, the diaphragm in the ca e E will bepressed downward, carrying with it the rigid bar G, which. isarticulated tothe rock-shaft g, and consequently causes the left-handarm of lever I to descend gradually, and thus allow the valveplate of Bto sink by gravitation, and thus diminish accordingly the area of thefire-draft opening in the valve. At the same time the righthand arm ofthe lever I, rising, lifts gradually the lower end of theplate of valve0, and allows a larger area of opening for the entrance of the coldfresh air into the airheating chamber, and thus further reduce thetemperature of the air in the said chamber; and if the temperature bestill too high, the

lever I becomes farther tilted downward, and

time the fire get too low, and the air too much reduced in temperature,the damper-valve D immediately closes, the opening between the plate andseat of the valve 0 reduced, and the opening in the valve B enlarged.

It will be seen thatif the connecting devices between the valves B O Dbe properly adjusted to cause the air passing through the air-heatingchamber to be heated to the re quired degree of temperature by anordinarily-good fire in the furnace, the same, or nearly the same,temperature of the air will be maintained automatically, notwithstandingany variations inthe strength of fire in the furnace.

It will also be seen that, if the fire should become extinguished, assometimes will be "the case for want of fresh fuel, especially in thenight, the valve 0 will become entirely closed, in consequenceof thewider opening of the valve B, and consequently the entrance of freshcold air into the air-heating chamber ed alike, except as to size,substantially as represented in Fig. l.

Theseat of each valve is oval in the area of its opening or throat, andthe oval is formed her.

by cutting 011' the cylindrical conduit-pipe at alignment with theshorter diameter of the oval, (see Fig. 2,) andthen the edgeof the hupper half of the oval turned inward, and the edge of the lower halfturned outward, as represented by 7 and 8, respectively, thus producingtwo'flat bearings nearly in the plane 7 of ,the oval opening.

The plate of each valve is of sheet metal, and cut out so that oneend,9, (seeFig. 3,) will accurately fit against the under side of thebearing 7 of Fig.2, and the other or heavier and larger end, 10, so thatit will fit over on the bearing 8, and so cut out also as to leavetwoprojections or ears,.ll11, at {its side edges, substantially asrepresented in Fig. 3. The two parts, Figs.2 and 3,-arethen adjustedtogether, with the end!) of theplate against the under side of the-plane7, and the end 10 of said plate upon the upper side of 8,

and finally the ears 11 11 bent down overand slightly under therespective square-cut ends of the plane 8, which connecting parts willthen serve as the axis of motion for the valveplate, and thusdispensewith'the use of arbors or journals for the purpose.

I claim as my invention I l. The combination, in an automatich'eat;regulator for air-heating furnaces, substantial- 1y as described, of theautomatically actuated valve 0, with the moutlror entrance opening forthe fresh cold air into the air-heatin g chain;

2. The combination, in an air-heatingfurnace, substantially asdescribed, of the valve O with the valves B and D, all of the saidvalves being actuated, whenin use, by the variations of thetemperatureof the airin the air-heating chamber of the furnace, andithe gravitatingtendency of the lower ends ofthe respective valve-plates, as described.

3. The valves B G D, each consisting of the combination of the inclinedoval seat, having the flat bearings 7 and 8, and the valve-plate 9 10,having the projecting ears 11 11,. the plate and seat being attachedtogether,as desoribed and shown in Fig. 1. l

ISAAC HAYES.

Witnesses:

BENJ. MORISON, WM. H. MomsoN.

